Abstract

MARTINEZ SOTO, Rodolfo Alejandro et al. Carbon and nitrogen stock in a Cambisol soil under two land uses in Linares, Nuevo Leon, Mexico. Rev. mex. de cienc. forestales [online]. 2023, vol.14, n.79, pp.4-30.  Epub Oct 06, 2023. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v14i79.1339.

The organic Carbon of the soil is related to the physical, chemical, and biological properties of the soil, while Nitrogen is an essential macroelement in plant growth. To know the Carbon and Nitrogen stock in a Cambisol, a study was carried out in Linares, Nuevo León, Mexico. Four composite samples (n=4) (individual subsamples) were collected at five depths (0-5, 5-15, 15-30, 30-60 and 60-100 cm), in two land uses: Tamaulipan Thorny Scrub (MET) and Induced Grassland for livestock use, obtaining 40 samples in total (20 each land use); the chemical variables analyzed were soil organic Carbon percentage (COS), total Nitrogen (Nt) and the ratio C:N was estimated. Likewise, bulk density (Da) was determined to calculate the COS and Nt storage (Mg ha-1). The mean percentage of COS and Nt for the MET were 2.87 and 0.28 %, and Grassland were 2.21 and 0.21 %. Statistical analyses showed that there are differences in the COS and Nt reservoirs between land uses and depths. The COS and Nt reservoirs in the entire profile analyzed (0-100 cm) for the MET were 164.99 and 19.83 Mg ha-1, and for Grassland 146.07 and 17.81 Mg ha-1, respectively. While the average C:N ratio for the MET was 9.28 and Grassland was 10.73. Change in land use from MET to Grassland caused a decrease in the COS and Nt reservoirs of 11.47 and 10.17 %, respectively.

Keywords : Storage; strata; Tamaulipan Thornscrub; Grassland; soil profile; C:N ratio.

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